CBSE Class 12 Chemistry Biomolecules Quiz 4

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CBSE › Class 12 › Chemistry › Biomolecules

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1. Mark the wrong statement about denaturation of proteins

A The primary structure of the protein does not change B Globular proteins are converted into fibrous proteins C Fibrous proteins are converted into globular proteins D The biological activity of the protein is destroyed

2. In fibrous proteins, polypeptide chains are held together

A van der waals forces B electrostatic forces of attraction C hydrogen bonds D covalent bonds

3. Which type of interactions are responsible for making the a-helix structure stable?

A Peptide bonds between -NH B Hydrogen bonds between -NH of amino acid in the one turn with -CO of amino acid to adjacent turn C -OH group of one amino acid with -CO group of other amino acid on the turn D Hydrogen bonds between adjacent amino acids

4. Which of the following is an acidic amino acid?

A Glycine B Valine C Leucine D Glutamic acid

5. The melting points of amino acids are higher than the corresponding hal-acids because

A amino acids exist as zwitter ions resulting in strong dipole-dipole attraction B amino acids are optically active C due to higher molecular mass of-NH D they interact with water more than halo-acids and have salt like structure

6. Most common types of secondary structures of proteins are

A a-helix and P-helix structures B a-helix and P-pleated sheet structures C right and left hand twisted structures D globular and fibrous structures

7. Mark the incorrect example

A Keratin and myosin-fibrous proteins B Insulin and albumines-Globular proteins C Glycylalanine-Djpeptide D Enzymes and haemoglobin-Derived proteins

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